Python: Snippet Multiprocessing

Wenn es möglich ist Jobs zu parallelisieren kann man Multiprocessing unter Python verwenden.

#!/usr/bin/env python

import os
from multiprocessing import Pool



def worker(job):
    x, y = job

    result = x ** y

    if hasattr(os, 'getppid'):
        print "parent process pid:", os.getppid()
    print "process pid:", os.getpid()

    print "result is: ", result
    print "---"


if __name__ == '__main__':
    jobs = [(1, 2), (3, 4), (5, 6), (11, 12), (13, 14), (15, 16), (21, 22), (23, 24), (25, 26)]
    pool = Pool(processes=5)

    for job in jobs:
        pool.apply_async(worker, args=(job,))

    pool.close()
    pool.join()

Result:

max@cmkdev:~$ python mp.py 
parent process pid: 19599
process pid: 19600
result is:  1
---
parent process pid: 19599
process pid: 19601
result is:  81
---
parent process pid: 19599
process pid: 19602
result is:  15625
---
parent process pid: 19599
process pid: 19602
result is:  3138428376721
---
parent process pid: 19599
process pid: 19600
result is:  6568408355712890625
---
parent process pid: 19599
process pid: 19600
result is:  122694327386105632949003612841
---
parent process pid: 19599
process pid: 19600
result is:  480250763996501976790165756943041
---
parent process pid: 19599
process pid: 19602
result is:  2220446049250313080847263336181640625
---
parent process pid: 19599
process pid: 19604
result is:  3937376385699289
---